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<h1 class="annex">一般用法</h1>
<p>4.1 GFC文件中应有且仅有一个工程项目（<a href="schema\Gfc2Project.html">Gfc2Project</a>）实例。</p>
<p>4.2 工程项目（<a href="schema\Gfc2Project.html">Gfc2Project</a>）实例应聚合多个空间结构实体（<a href="schema\Gfc2SpatialStructureEntity.html">Gfc2SpatialStructureEntity</a>），一般为建筑（<a href="schema\Gfc2Building.html">Gfc2Building</a>）实例。</p>
<div align="center"><img src="img/usage_project_building.png"/></div>
<p>4.3 建筑（<a href="schema\Gfc2Building.html">Gfc2Building</a>）实例应聚合多个楼层（<a href="schema\Gfc2Floor.html">Gfc2Floor</a>）实例。</p>
<div align="center"><img src="img/usage_building_floor.png"/></div>
<p>4.4 楼层（<a href="schema\Gfc2Floor.html">Gfc2Floor</a>）实例应聚合多个构件或图元（<a href="schema\Gfc2Entity.html">Gfc2Entity</a>）实例。</p>
<div align="center"><img src="img/usage_floor_entity.png"/></div>
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